Locomotive max speed under load?

NtheBasement Apr 5, 2019

  1. NtheBasement

    NtheBasement TrainBoard Member

    I have a question regarding the max speed of diesel engines. On a prototype diesel, is the max speed available under load?

    Reason for the question: I'd like to as much as possible configure my DCC loco's performance to match the prototype. For example in Wiki it says the max on an SD60 is 70mph. I can put my model on the track and use a stop watch to set the max speed in the decoder to match 70 mph, but of course once I add a string of cars the speed at max throttle is much slower than the one I set under no load conditions.
  2. acptulsa

    acptulsa TrainBoard Member

    That depends on the gearing, and what the railroad that owns it considers a proper load.
  3. Akirasho

    Akirasho TrainBoard Member

    Max speed would depend on a myriad of factors! Over the past 10 days, I've watched 2 trains stall (before reaching the curve) on Horseshoe and quite a few survive owing to AC traction as they creeped at a brisk walk pace!!

    Then, I've watched trains haul the proverbial donkey at La Plata!
    ddm502001 likes this.
  4. DJ of DJsTrains

    DJ of DJsTrains TrainBoard Member

    Speed isn't the issue. On our older EMD engines there is a time limit Once we hit the red (1200 amps then its 15 minutes, then 1300 amps is 12 minutes, then 1500 amps is 5 minutes). We can easily burn out a traction motor or even burn the rail from spinning wheels but not moving. The newer units don't have these short time ratings.
    ddm502001 and NtheBasement like this.

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